Mark III
The Mark III was launched by Mesa/Boogie in 1985. It introduced a third channel, a "crunch" rhythm sound right in between the rhythm and lead channels. This amp has a dual footswitch system: one footswitch alternates between the current rhythm mode and the lead mode, and the other selects either the clean rhythm mode or the crunch rhythm mode. The two rhythm modes share all of their controls, while the lead mode only shares the rhythm modes' tone stack, featuring independent gain and master volume controls. The physical switch for the crunch rhythm mode was implemented as a push/pull switch above the Middle frequency control.
The Mark III went through multiple revisions, similar to the Mark II. Each revision had a slightly different voicing, but identical functionality. The amplifier had an aggressive voicing, and extreme brightness that is well suited for heavier music.
Read more about this topic: Mesa Boogie Mark Series
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